Digital hearing aid echo canceling method based on NLMS algorithm improvement

An echo cancellation and hearing aid technology, applied in hearing aids, electrical components, etc., can solve the problems of increased program jump frequency, high real-time requirements of algorithms, and increased computational complexity, so as to reduce computational complexity and meet real-time requirements. and accuracy requirements, avoiding computationally intensive effects
CN104754485AInactive Publication Date: 2015-07-01HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Publication Date
2015-07-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a digital hearing aid echo canceling method based on NLMS algorithm improvement. The digital hearing aid echo canceling method based on the NLMS algorithm improvement mainly includes that each input data in an M-size block updates N / M coefficients of interval M, after inputting M data, all the coefficients of an adaptive filter are updated. Good convergence rate and steady state error are guaranteed through controlling the upper limit and lower limit of step size normalization. The digital hearing aid echo canceling method based on the NLMS algorithm improvement is capable of realizing the hearing aid echo canceling, lowering the computation complexity of the algorithm, guaranteeing the controllability of the algorithm performance and meeting the timeliness and precision demands of a hearing aid.
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Description

technical field

[0001] The invention relates to the technical field of speech signal processing, in particular to an echo cancellation method for a digital hearing aid. Background technique

[0002] The traditional NLMS (Normalized Least Mean Square) algorithm is an adaptive algorithm based on the improvement of the LMS algorithm. It is simple to implement and reduces the impact of the input signal amplitude on the performance of the algorithm by normalizing the energy. It has high robustness and low steady-state error. Small. However, due to the fact that updating all the coefficients point by point increases the computational complexity, the program jump frequency increases, and the echo cancellation of the hearing aid has high requirements for the real-time performance of the algorithm. Therefore, it is necessary to improve the NLMS algorithm to meet the actual real-time requirements. Contents of the invention

[0003] In order to solve the problems in the prior art, t...

Claims

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